You shouldn't really need to know the password for the maximizer_default user. Why do you ask? I have seen an issue where I have tried to move an address book from one MaxExchange remote machine to another and it say that the login credentials for the maximizer_default user are incorrect. So really we need to find out what you are trying to do to see if there is a better way of doing it.
FYI, I don't know the password either ;-)